MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Vanadium crystals, light micrograph. Vanadium is a rare soft metal that is found in various minerals, coal and petroleum. It is most often used in steel alloys to add strength and resistance to corrosion. Vanadium is also biologically important, being found in enzymes in nitrogen- fixing microorganisms and the blood of ascidians (sea squirts), where its function is not understood.
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